Paper-cutting machine



March 9 1926. 1,575,649

C. SEYBOLD PAPER CEJTTING MACHINE Filed A ril 12, 1324 Patented Mar. 9,1926.

UNITED STATES CHARLES SEYBOLD, F DAYTON, OHIO.-

PAPER-GUTTING MACHINE.

, Application filed April 12, 1924. Serial No. 706,188.

To all whom it may comer n:

Be it known that I, CHARLES SEYBOLD, a citizen of the United States, anda resident of Dayton, in thecounty of Montgomery and State of Ohio, haveinvented certainnew and useful Improvements in Paper- Cutting Machines,of which the following is a full, clear, and exact description,reference being had to the accompanying drawing. forming part of thisspecification.

My invention relates to the clamping mechanism for power paper cuttingmachines, whereby the clamp for the paper piles may be actuated underdirect spring pressure from the driving mechanism of the machine withoutthe intervention of any friction clutch mechanism to hold the clamp toits work when the maximum clamp pressure has been attained, and also toprovide a construction in which the power required for the'applicationof the necessary pressure shall .be, automatically controlled to'varythe pressure in proportion'to the height of the pile, a moderatepressure when the pile is low and automatically increasingas the heightof the pile increases. I

Another feature of the importance is the arrangement whereby a compoundleverage is obtained, whereby each pound of pressure applied may beenhanced many t1m es in its application to the paper pile and in whichcomparatively light springs are required for the work.

The invention consists of that certain novel construction andarrangement of parts to be hereafter more particularly pointed out andclaimed, whereby the above results are attained.

In the drawing:

Figure 1 is a side elevation of a paper cutting machine illustrating myimproved clamping mechanism.

Figure 2 is a perspective view of a por- -tion of the mechanism. 7

In the drawings, I have only illustratedsuch parts of the paper cutteras, may be necessary to show the application of my invention to anordinary paper cutter of typical construction and it will be understoodthat the mechanism can readily be applied to any of a great variety offamiliar types of machines. As illustrated, 1 is the base of the machinewith 2 the cutting table, 3

.the clamp and 4 one of the side housings.

Securely bolted to the side of the base is a bracket 5 on which anL-shaped lever 6 is fulcrumed 'on the bolt 7. A pair of hangers 8, 8,are also pivoted on this same bolt 7, so that they can rock freely. Thelower ends of these hangers carry a cam roller 9 between them, which isengaged by the cam 10 on the power knife drivmg shaft 11, of themachine. The pin on wh1ch the cam roller 9 is mounted also carries therollers 12, 12, outside the hangers 8, 8, which rollers bear against thedouble inclined surface 13 on the lever 14, which is pivoted on the pinat the outer endof theL-shaped lever 6.

The lever 14 just beyond thepivot 15 carries a U-shaped hanger 16pivoted at 17 which hanger suspends a coiled spring 18 the upper end ofwhich bears against a block 19, pivoted on the pin 20 at the outer endof an arm 21, projecting from the L-shaped lever 6. The spring 18 isheld in position and guided by the guide rod 22, which passes up throughthe block 19. The guide rod 1s threadedat each end and the spring 18 isplaced under tension by adjusting nuts so that tension is exerted on thelever 14 to hold the stop 24 on the lever normall agamst the set screw25 onthe lever 6. space bar 27 extends between the arm 21 and the lever6 to render the L-shaped lever more rigid.

On the upper. end of the L-shaped lever at 28 1s plvoted a curvedpressure lever 29, and on the pressure lever the roller 30 travels.Tllls roller is mounted in the outer end of the clamp pressure lever.31, which is secured on the clamp rock shaft 32, 'oumaled 1n thehousing 4, there being ano er similar lever on the other end of theshaft. The 1nner ends of the clam lever 31 are coupled by brass boxes34, w ich slide in slots in the lever for the clamp bar 3. i

The outer end of the curved pressure lever 29 is connected with theouter end of the lever 14, by a coiled spring 35. sprin 1s gulded by aspring rod 36, the lower en of which is screwed into a swivel 37 pivotedon the lever 14. The upper end of this spring rod is smaller in diameterand is threaded part of the way. A collar 38 is free to slide on thesmall diameter of the rod and acts as a guide for the spring and againstthis collar bears the adjusting nut 39 to adjust the tension of thespring. The collaris, bored smooth to slide on the rod 36 and extendsupwardly with a screw threaded extension'to screw mto the swivel leatherand a steel washer 42 and nuts 43. In order to hold the L-shaped leverin the position to which it may be rocked, as will be hereinafterdescribed, I provide a pawl and ratchet construction as follows:Fulcrumed on a pin 46 on the upper end of the lever 6, is a double pawl47 which carries pawl blades 48, secured by screws 49 so as to have aslight oscillating motion in the slot 50 in the pawl.

The opposite end of the pawl carries springs 51 in pockets which springsbear on spring pins 52, which ride on the circular edge 53 of thebracket 5. Two circular ratchets 54 are engaged by the pawl blades 43and hold the lever 6 from turning clockwlse.

' It is, however, necessary to release the pawl to permit the parts toreturn to normal position. Pivoted' to the pawls 1s a pawl lifting rod55, which extends down to the inner end of the lever 14 and to which issecured a shoe 56. This shoe normally rests against a block 57, securedto the lever 14. Now when the lever 14 is rocked as W111 be hereinafterdescribed, the end of the shoe drops to the upper side of the block andwhen the lever 14 rocks back to normal pos1- tion, the rod 55 is liftedwhich raises the pawls 47 from engagement with the ratchet teeth 54,releasing the L-shaped lever and allowing it to rock clockwise tonormalposition, while at the end of this movement, the rod 55 comes intocontact with a knock off plate 58 secured to the bracket 5 and the shoe56 is knocked off of the block 57 and allows the pawls 47 to return toengagement with the ratchet 54.

The mechanism operates as follows:

The paper pile being placed on the table and the machine set inoperation, the cam 10 hearing on the roller 9, tends to rock the lever14, and inasmuch as a framework is formed by the L-shaped lever 6, thecurved pressure lever 29 and the spring 35 connecting the ends of lever29 and lever 14, the entire framework rocks on the pivot 7 as a fulcrumand the roller 30 rides up the curved surface of lever 29, and lifts theclamp pressure lever 31, lowering the clamp to the paper pile, applyingpressure thereon, until the spring 35 compresses within its limits.During this movement. a compound leverage is obtained as the distancefrom end of lever 29 to the roller is much greater than the horizontaldistance from the roller swans to the fulcrum. It will also be notedthat as the roller rides out on the lever 29 this leverage decreases sothat for high piles of paper the power applied is greater than with lowpiles, and that the power ap lied s direct-l proportional to the height0 the paper pi e. Now when full compression of the pie is obtained inthis way, the continued rotation of the cam on the cam roller causes thelever 14 to rock away from the stop 24 against a slight compression ofthe spring 18 and the rod 36 moves upwardly through the swivel 40,maintaining the full compression of the paper pile under the tension ofspring 35, and here again for this final movement of the power cam, Ihave increased leverage as the distance of the pivot 15 to the camroller is very much greater than the distance to the swivel 37.

The pawls 47 hold the clamp shaft in the position it may be rocked bythe mechanism, and during the final movement of the driving cam, thelever 14 separates from the stop 25 allowing the pawl lifting rod todrop under the block 57 so that as soon as the driving cam has passedits high point the spring 18 returns the lever 14, and the pawls arereleased which allows the L-shaped lever 6 to rock back to its normalposition. The clamp shaft is provided with the usual coiled spring (notshown) to rock the shaft and return the clamp to its high position readyfor the next operation. In view of the fact that with my improvedconstruction as above described, every pound of pressure exerted by thedriving cam will give approximately ten pounds of pressure on the clamp,comparatively light springs may be employed and the compression of thesprings is also slight, so that the wear and tear is reduced to aminimum.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is

1. In a device of the character specified, a paper support and a clampbar to hold the paper pile on the support, a rock lever and connectiontherefor with the clamp to operate same, a. s ring operating on the rocklever to hol the clamp bar under spring tension and through which theultimate clamp pressure is applied, a lever pivoted on the rock leverfor actuating the same to apply the tension, and a power means toactuate the rock lever, while permitting the full operation of the powermeans.

2. In a device of the character specified, a paper sup ort and a clampbar to hold the paper pi e on the support, a rock lever and connectiontherefor with the clamp to operate same, a spring operating on the rocklever to hold the clamp bar under spring tension and through which theultimate clamp pressure is applied, a lever pivoted on'the rock leverfor actuating the same, to apply the tension, and a power driven cam toactuate the last mentioned lever, with means to permit this lever toyield to permit the full operation of the cam, while maintaining thespring tension. 3. In a device of the character specified, a paper suport and a clamp bar to hold the paper .pi andconnection therefor withthe clamp to operate same, a spring operating on the rock lever to holdthe clamp bar under spring tension, a lever pivoted on the rock leverfor actuating the same to apply the tension, and a power drivencam toactuate the last mentioned lever, with a second spring to .maintain theultimate resilient tension of the rock lever while permitting the leverto yield for the full cam action.

4, In a device of the characterspecified, a paper support and a clampbar to hold the paper pile on the support, arock lever and connectiontherefor with the clamp to operate same a spring operating on the rocklever to hold the clamp bar under spring tension and through which theultimate clamp pressure is applied, a lever pivoted on the rock leverfor actuating the same to apply the tension, and a ower means to actuatethe rock lever, an means to hold the rock lever, as it is rocked by thepower means. 7

5. In a device of the character specified, a clamp bar to hold the paperpi e on the sup ort, a rock lever and connection therefor with the clampto operate the same, a s ring operating on the rock lever to hold t eclamp under ultimate spring tension, a lever pivoted on the rock lever ainst which the spring operates and powerriven means bearing on the leverto actuate the rock lever, with a sprin to maintain the tension on thislever,"an to 't the lever to yield for the full opers.

e on the support, a rock lever ation of the power drivennmeans, withoutreleasing the sprin tension.

6. In a device 0 the character specified,

hold v lever with a spring bearing between thelever and the 1 outer endof the actuating portion of the L-shaped lever connecting with the clampbar, a second spring bearing between the actuating lever and the L-.

shaped lever to hold same in position, and a power driven cam bearing onsaid actuatinglever. to apply resilient pressure on the clamp, wherebythe yield to permit the complete operation of the cam, without releasingthe clamp pressure. I V y 7 In a device of the character specified, apaper support and a clamp bar to hold the pa e! on the support, anL-shaped lever pivote on the frame, with connection therefor with theclamp bar to operate same, an actuating lever pivoted to the L-shapedlever with a spring bearing between the outer end of the actuating leverand the portion of the L-shaped lever connecting with the clamp. bar, asecond spring hear ing between the actuating lever and the L- shapedlever to hold same in position, and a power driven cam bearing onsaid'actuating lever to apply resilient pressure on the clamp, wherebythe actuating lever. may

yield to permit the complete operation of the cam, without releasin theclamp pressure, and a pawl and rate at to hold the L- shaped lever inposition with connection intermediate the awl and actuating lever torelease the paw at the completion of the cam throw.

actuating lever may- CHARLES SEYBOLD.

